c12s-kubespray/contrib/terraform/upcloud/README.md

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# Kubernetes on UpCloud with Terraform
Provision a Kubernetes cluster on [UpCloud](https://upcloud.com/) using Terraform and Kubespray
## Overview
The setup looks like following
```text
Kubernetes cluster
+--------------------------+
| +--------------+ |
| | +--------------+ |
| --> | | | |
| | | Master/etcd | |
| | | node(s) | |
| +-+ | |
| +--------------+ |
| ^ |
| | |
| v |
| +--------------+ |
| | +--------------+ |
| --> | | | |
| | | Worker | |
| | | node(s) | |
| +-+ | |
| +--------------+ |
+--------------------------+
```
The nodes uses a private network for node to node communication and a public interface for all external communication.
## Requirements
* Terraform 0.13.0 or newer
## Quickstart
NOTE: Assumes you are at the root of the kubespray repo.
For authentication in your cluster you can use the environment variables.
```bash
export TF_VAR_UPCLOUD_USERNAME=username
export TF_VAR_UPCLOUD_PASSWORD=password
```
To allow API access to your UpCloud account, you need to allow API connections by visiting [Account-page](https://hub.upcloud.com/account) in your UpCloud Hub.
Copy the cluster configuration file.
```bash
CLUSTER=my-upcloud-cluster
cp -r inventory/sample inventory/$CLUSTER
cp contrib/terraform/upcloud/cluster-settings.tfvars inventory/$CLUSTER/
export ANSIBLE_CONFIG=ansible.cfg
cd inventory/$CLUSTER
```
Edit `cluster-settings.tfvars` to match your requirement.
Run Terraform to create the infrastructure.
```bash
terraform init ../../contrib/terraform/upcloud
terraform apply --var-file cluster-settings.tfvars \
-state=tfstate-$CLUSTER.tfstate \
../../contrib/terraform/upcloud/
```
You should now have a inventory file named `inventory.ini` that you can use with kubespray.
You can use the inventory file with kubespray to set up a cluster.
It is a good idea to check that you have basic SSH connectivity to the nodes. You can do that by:
```bash
ansible -i inventory.ini -m ping all
```
You can setup Kubernetes with kubespray using the generated inventory:
```bash
ansible-playbook -i inventory.ini ../../cluster.yml -b -v
```
## Teardown
You can teardown your infrastructure using the following Terraform command:
```bash
terraform destroy --var-file cluster-settings.tfvars \
-state=tfstate-$CLUSTER.tfstate \
../../contrib/terraform/upcloud/
```
## Variables
* `prefix`: Prefix to add to all resources, if set to "" don't set any prefix
* `template_name`: The name or UUID of a base image
* `username`: a user to access the nodes, defaults to "ubuntu"
* `private_network_cidr`: CIDR to use for the private network, defaults to "172.16.0.0/24"
* `ssh_public_keys`: List of public SSH keys to install on all machines
* `zone`: The zone where to run the cluster
* `machines`: Machines to provision. Key of this object will be used as the name of the machine
* `node_type`: The role of this node *(master|worker)*
* `cpu`: number of cpu cores
* `mem`: memory size in MB
* `disk_size`: The size of the storage in GB
* `additional_disks`: Additional disks to attach to the node.
* `size`: The size of the additional disk in GB
* `tier`: The tier of disk to use (`maxiops` is the only one you can choose atm)